Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
ASSETS
Cash and cash equivalents	$ 34	$ 24
Restricted cash	45	64
Accounts receivable	1,397	1,690
Securitized regulatory assets	637	690
Total Assets	52,028	48,846
LIABILITIES
Accounts payable	1,312	1,387
Regulatory liabilities — current	114	181
DTE Electric
ASSETS
Cash and cash equivalents	6	11
Restricted cash	41	48
Securitized regulatory assets	637	690
Total Assets	37,747	35,221
LIABILITIES
Regulatory liabilities — current	60	156
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	6	6
Restricted cash	45	64
Accounts receivable	25	27
Securitized regulatory assets	637	690
Notes receivable	665	657
Other current and long-term assets	1	1
Total Assets	1,379	1,445
LIABILITIES
Accounts payable	21	26
Accrued interest	4	12
Regulatory liabilities — current	25	27
Securitization bonds	657	706
Other current and long-term liabilities	13	20
Total liabilities	720	791
Notes receivable	16	14
Current portion of securitization bonds	75	71
Variable interest entity, primary beneficiary | DTE Electric
ASSETS
Cash and cash equivalents	0	0
Restricted cash	41	48
Accounts receivable	5	6
Securitized regulatory assets	637	690
Notes receivable	0	0
Other current and long-term assets	0	0
Total Assets	683	744
LIABILITIES
Accounts payable	0	0
Accrued interest	3	12
Regulatory liabilities — current	25	27
Securitization bonds	657	706
Other current and long-term liabilities	0	0
Total liabilities	685	745
Current portion of securitization bonds	$ 75	$ 71